Root form and canal morphology of mandibular premolars in a Jordanian population

Abstract

The prevalence of multiple canals in the investigated Jordanian mandibular premolars was high, especially for the second mandibular premolar, in comparison with previous studies performed on populations of different racial origin.

Micro-CT Evaluation of Root and Canal Morphology of Mandibular First Premolars with Radicular Grooves

“…Current knowledge derived from micro-CT studies indicated that this ribbon canal space in mandibular first premolars is frequently eccentric to the lingual side of the C-shaped radicular dentin, and that C-shaped canal varies considerably in shape at different levels (13)(14)(15)17,18,20,27). In this study, the percentage frequency of C-shaped canals was high (18.57%), but within the range of 10.7% to 29% reported in the literature (9,11,13,14,16,20,28,29). In contrast, a recent micro-CT study reported C-shaped canal configuration in 67% of the mandibular first premolars with radicular grooves from a Brazilian subpopulation (30).…”

“…However, the cross-sectional appearance of the root canal (roundness and form factor) indicates an oval shape which, combined with multiples orifices, accessory canals, apical delta and a high incidence of C-shaped configuration (Table 2; Fig. 3), could compromise adequate cleaning and shaping procedures (11,15,16,18). Accessory canals were observed in nearly half of the sample (45.7%; n=32), as also reported by Gu et al (15) Among these teeth, 37.5% (n=12) had transverse accessory canals exiting at the deepest invagination of the developmental groove (Fig.…”

“…In spite of root and canal morphologies of the mandibular first premolar teeth have been described is different ethnic groups (4,(6)(7)(8)(9)11,15,16,18,20,21), literature lacks detailed data on the relationship between RG and root canal morphology in this group of teeth specially in African, Australasian, South East Asian and South American populations. Therefore, the purpose of this study was to evaluate the external and internal morphologies of singlerooted mandibular first premolars with radicular grooves from a Brazilian subpopulation, using micro-CT technology.…”

“…The RG is relevant in clinics as its depth may act as a reservoir for dental plaque and calculus, increasing the difficulty for the management of periodontal disease (13)(14)(15). In mandibular premolar teeth, its presence has been associated to anatomical complexities of the root canal system, such as canal bifurcation and C-shaped canal configuration (11,(13)(14)(15)(16)(17)(18). These complexities are frequently neglected, and the inability to recognize and adequately treat all root canal system helps to explain the highest failure rate in nonsurgical canal therapy of this group of teeth (11.45%) as previously reported (19).…”

Avaliação, por meio de microtomografia computadorizada, da anatomia externa e interna de pré-molares inferiores com sulcos radiculares

“…Esses estudos evidenciam que o número de canais radiculares pode variar em cada grupo de dentes, em cada pessoa e, de modo geral, em cada grupo racial (CURZON, 1974;AHMED et al, 2007 GULABIVALA et al, 2001;SERT;BAYIRLI, 2004, AWAWDEH;AL-QUDAH, 2008;LEONI et al, 2013), o que possibilitou a inclusão de dois novos tipos morfológicos: tipo 1-2-5-4-5-4 e 1-3-2-3, provavelmente em função da maior acuidade da metodologia usada no presente estudo, uma vez que a μTC que permite detectar com maior precisão áreas em que as paredes estão encostadas ou unidas. Esses achados são importantes para indicar a necessidade de novos protocolos de preparo, irrigação e obturação do SCR, capazes de promover um tratamento mais adequado e efetivo para cada tipo de anatomia dental, favorecendo o sucesso do tratamento endodôntico.…”